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Commit a4796e37 authored by NeilBrown's avatar NeilBrown Committed by Trond Myklebust
Browse files

MM: export page_wakeup functions 



This will allow NFS to wait for PG_private to be cleared and,
particularly, to send a wake-up when it is.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
Acked-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent cbbce822

include/linux/pagemap.h

+8 −2
Original line number Diff line number Diff line
@@ -496,8 +496,8 @@ static inline int lock_page_or_retry(struct page *page, struct mm_struct *mm, 
}



/*

 * This is exported only for wait_on_page_locked/wait_on_page_writeback.

 * Never use this directly!

 * This is exported only for wait_on_page_locked/wait_on_page_writeback,

 * and for filesystems which need to wait on PG_private.

 */

extern void wait_on_page_bit(struct page *page, int bit_nr);
@@ -512,6 +512,12 @@ static inline int wait_on_page_locked_killable(struct page *page) 
	return 0;

}



extern wait_queue_head_t *page_waitqueue(struct page *page);

static inline void wake_up_page(struct page *page, int bit)

{

	__wake_up_bit(page_waitqueue(page), &page->flags, bit);

}



/* 

 * Wait for a page to be unlocked.

 *

mm/filemap.c

+2 −6
Original line number Diff line number Diff line
@@ -670,17 +670,13 @@ EXPORT_SYMBOL(__page_cache_alloc); 
 * at a cost of "thundering herd" phenomena during rare hash

 * collisions.

 */

static wait_queue_head_t *page_waitqueue(struct page *page)

wait_queue_head_t *page_waitqueue(struct page *page)

{

	const struct zone *zone = page_zone(page);



	return &zone->wait_table[hash_ptr(page, zone->wait_table_bits)];

}



static inline void wake_up_page(struct page *page, int bit)

{

	__wake_up_bit(page_waitqueue(page), &page->flags, bit);

}

EXPORT_SYMBOL(page_waitqueue);



void wait_on_page_bit(struct page *page, int bit_nr)

{